Vim plugin docs improvements (psf#3468)

* Organize vim plugin section with headers to separate out Installation, Usage, and Troubleshooting for readability and easy linking

* Add missing plugin configuration options, with current defaults

* Add installation note for Arch Linux, now that the plugin is shipped with the python-black package (ref: https://bugs.archlinux.org/task/73024)

* Fix vim-plug specification to follow stable releases. Moving the same tag is an antipattern that doesn't re-resolve with vim-plug, see this discussion for more detail (junegunn/vim-plug#720). Per vim-plug's maintainer's recommendation, use the 'tag' key instead with a shell wildcard. Wildcard should be '*.*.*' as that follows Black's versioning detailed here (https://black.readthedocs.io/en/latest/contributing/release_process.html\#cutting-a-release) and doesn't include current alpha releases.

CHANGES.md

@@ -75,6 +75,8 @@
 <!-- Major changes to documentation and policies. Small docs changes
      don't need a changelog entry. -->
 
+- Expand `vim-plug` installation instructions to offer more explicit options (#3468)
+
 ## 22.12.0
 
 ### Preview style

docs/integrations/editors.md

@@ -111,16 +111,51 @@ Configuration:
 - `g:black_fast` (defaults to `0`)
 - `g:black_linelength` (defaults to `88`)
 - `g:black_skip_string_normalization` (defaults to `0`)
+- `g:black_skip_magic_trailing_comma` (defaults to `0`)
 - `g:black_virtualenv` (defaults to `~/.vim/black` or `~/.local/share/nvim/black`)
+- `g:black_use_virtualenv` (defaults to `1`)
+- `g:black_target_version` (defaults to `""`)
 - `g:black_quiet` (defaults to `0`)
 - `g:black_preview` (defaults to `0`)
 
+#### Installation
+
+This plugin **requires Vim 7.0+ built with Python 3.7+ support**. It needs Python 3.7 to
+be able to run _Black_ inside the Vim process which is much faster than calling an
+external command.
+
+##### `vim-plug`
+
 To install with [vim-plug](https://github.com/junegunn/vim-plug):
 
+_Black_'s `stable` branch tracks official version updates, and can be used to simply
+follow the most recent stable version.
+
 ```
 Plug 'psf/black', { 'branch': 'stable' }
 ```
 
+Another option which is a bit more explicit and offers more control is to use
+`vim-plug`'s `tag` option with a shell wildcard. This will resolve to the latest tag
+which matches the given pattern.
+
+The following matches all stable versions (see the
+[Release Process](../contributing/release_process.md) section for documentation of
+version scheme used by Black):
+
+```
+Plug 'psf/black', { 'tag': '*.*.*' }
+```
+
+and the following demonstrates pinning to a specific year's stable style (2022 in this
+case):
+
+```
+Plug 'psf/black', { 'tag': '22.*.*' }
+```
+
+##### Vundle
+
 or with [Vundle](https://github.com/VundleVim/Vundle.vim):
 
 ```
@@ -134,6 +169,14 @@ $ cd ~/.vim/bundle/black
 $ git checkout origin/stable -b stable
 ```
 
+##### Arch Linux
+
+On Arch Linux, the plugin is shipped with the
+[`python-black`](https://archlinux.org/packages/community/any/python-black/) package, so
+you can start using it in Vim after install with no additional setup.
+
+##### Vim 8 Native Plugin Management
+
 or you can copy the plugin files from
 [plugin/black.vim](https://github.com/psf/black/blob/stable/plugin/black.vim) and
 [autoload/black.vim](https://github.com/psf/black/blob/stable/autoload/black.vim).
@@ -148,9 +191,7 @@ curl https://raw.githubusercontent.com/psf/black/stable/autoload/black.vim -o ~/
 Let me know if this requires any changes to work with Vim 8's builtin `packadd`, or
 Pathogen, and so on.
 
-This plugin **requires Vim 7.0+ built with Python 3.7+ support**. It needs Python 3.7 to
-be able to run _Black_ inside the Vim process which is much faster than calling an
-external command.
+#### Usage
 
 On first run, the plugin creates its own virtualenv using the right Python version and
 automatically installs _Black_. You can upgrade it later by calling `:BlackUpgrade` and
@@ -187,6 +228,8 @@ To run _Black_ on a key press (e.g. F9 below), add this:
 nnoremap <F9> :Black<CR>
 ```
 
+#### Troubleshooting
+
 **How to get Vim with Python 3.6?** On Ubuntu 17.10 Vim comes with Python 3.6 by
 default. On macOS with Homebrew run: `brew install vim`. When building Vim from source,
 use: `./configure --enable-python3interp=yes`. There's many guides online how to do